 Down here we have this facility unit. It's called the state circle shale and this unit was deposited in a deep marine environment. The people that first excavated this road cutting actually found some fossils of this really interesting organism. It's called a graptolite when they were doing their excavations and this type of organism only lives underwater. So these sediments were deposited by turbidity currents that brought in this silt and deposited it here. Up here we have a more sandy unit. I can feel here that the grains in it are much coarser than down here and interbedded within the sandy units. We've got a bit of fine grained shale as well, some more fine facility layers and this was deposited in a much more shallow setting compared to what's down here. It was still underwater and here we actually have an unconformity. So what happened here was that this material was deposited first. It was buried by more material that it was buried by more sediments that came on top of it. Potentially some subsidence was going on as well while that was occurring. This would have been lithified, lifted above sea level and then eroded to create this wavy surface here, the unconformity. This unconformity represents a gap in time because we have sediments that have been lost from the geological record here. So here this gap in time is on the water over a few million years and then after that erosion took place, sea came back into this area depositing this sand and these silty layers as well. So we're in this silty layer underneath the unconformity which is up there and here we can see that we have these big round, globular shapes of sandstone that are inside the silt. Here we can see an exception to the rule that Brad told you about that when you find inclusions of some rocks within other rocks, Brad was telling you that the inclusions are often older than the rocks that they're included in. This is an exception in that the inclusions are at the same age as these inclusions of sandstone are actually the same age as the silt that they're sitting in because they both, so the sand fell into the silt while the sand was soft and hadn't been lithified and the same with the silt it hadn't been lithified at that time either. They were lithified together. Now it's kind of hard to see on camera but I assure you that in other places along this outcrop in this sandy layer you can actually see a finding up sequence. So you can see within beds of sandstone that at the base of the bed the grains start out as coarse and they become finer and finer as you go up in a gradual manner and so that indicates that that way is up and so I couldn't find any really good way up indicators in this unit down below but it's really unlikely that this would have been completely overturned and this deposited on top of that so it's pretty safe to assume that this way is up here as well. So we know that this is older than this so we have a sequence of events here we have a relative timescale and so this is the relative timescale.